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E906 Gas System Cost of argon/ethane is $0.12 per ft3, or $4 per 1000 L. Cost of CF4/isobutane will range from $2- $4 per ft3, or about $100 per 1000 L. For 8 ft3/hr argon/ethane, we have $800/month. For 6 ft3/hr CF4/isobutane, we have $6k/month.

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E906 Gas System Layout (upstairs): Cylinders, high pressure regulators/manifolds, both mixers, alcohol bubbler are all in shed (located at south face of building). Ethane trailer and argon dewars would be just outside the shed. There will be a flowmeter panel indicating flow rates to each of the 4 stations, located inside the shed. Shed will be accessible 24/7.

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E906 Gas System Layout (downstairs): All distribution racks will be located on the experimental floor. Gas selection valves (inert/working), flowmeters, chamber pressure gauges, solenoid valves, will be monitored by cameras and/or other remote sensors. These racks will be inaccessible with the beam on, but should be stable once equilibrium conditions are achieved.

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E906 Gas System Overall view - argon/ethane: Mixing and distribution well understood. Existing designs for racks built during mid-90s will be re- implemented. An ethane trailer can be added if desired. Overall view – CF4/isobutane: Successfully mixed for HyperCP, but without recirculation. Non-trivial issues (both safety and technical) associated with recirculating fluorocarbon/ hydrocarbon mixtures are not well understood. Some R&D will likely be required before design can be finalized.

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E906 Gas System Cost to finish shed: $3k-$5k. Cost to finish mixers: $8k-$10k. Cost to finish distribution racks: $10k-$12k Cost for hall piping: $5k-$7k. Cost for recirculation: maybe $20k, assuming availability of surplus ANL components. Total is about $30k (without recirc), assuming that at least half of what we need is available as surplus from FNAL.

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E906 Gas System Concerns: Amount of time to get job done – barely enough if all goes well. Chamber leak rates – need to be less than 0.25 ft3/hr (110 cc/m) for any detector using a flammable mixture (FNAL rule). If recirculation is implemented, leak rate should be less than 10 cc/m per detector (at the operating pressure). Discuss recirculation issues with both industrial and research experts. Possible long-term contract for CF4 price break.